Butcherblock Acoustics "feet" effecting sound and isolation

OK so you're talking about components, not speaker right?  Speakers vibrate, components shouldn't.  the answer is the same but for slightly different reasons. so I'll give you my 2c.  I'm a physicist and I like to keep things simple.

So if you want your components to NOT be vibrated from the floor or the cabinet, you need to isolate them.  To do this, you need something that doesn't transmit vibrations.  Solids transmit vibrations very well.  Rubber and sand, less so.  Springs are the best at not transmitting vibrations.  So I put the relatively cheap Nobosound or similar under my important equipment. 

Hate to say it but butcherblock is good hard wood and transmits vibrations pretty well.  You mention "decoupling discs".  not sure what that is.  maybe gel, which is probably similar to rubber and somewhat decouples but less than springs.

Spikes do the opposite of decoupling. they couple.  

Jerry

@russ69 Makes you feel better is key.   Your granite may be large enough mass that the noises in the room cannot affect it.  the natural frequency of a spring system (from memory to excuse me if I get a constant wrong) is sqrt(k/m) where k is the spring constant.   so your very large m makes the natural frequency so low that it will not get excited by sound.  

I posted above about the physics involved.  Now @townshend-audio has posted and in their last paragraph they elaborated on the resonant frequeny relationships and that is why I went with Townshend.  I knew they had done the work and sized the springs to the mass of my speakers.  I use thier seismic platforms.